The symptoms of lumbago are more common during pregnancy, and the causes of lumbago in pregnant women are mainly due to: 1, pregnant women sit for a long time, lack of physical activity, chronic strain on the muscles of the waist and cause lumbago symptoms; 2, pregnant women have sex during pregnancy, too much force during sex, inappropriate position, resulting in excessive pressure on the muscles of the waist and lumbar vertebrae, and within a few days after sex, there will be lumbago 3, pregnant women sweat a lot during pregnancy, especially in the case of excessive sweating in the lumbar abdomen, if stimulated by the cool breeze will also cause symptoms of lumbar pain; 4, some women in pregnancy, the kidneys will be waterlogged or kidney stones and other diseases, causing lumbar pain and discomfort; 5, after pregnancy, the body’s hormone secretion abnormal, resulting in the ligaments of the lumbar spine parts of the bone and joint parts of laxity.